Fill in the blanks in whole numbers or fractions.
The ratio of adults to children is 3 : 5.
The ratio of boys to girls is 1 : 2.
The number of women to men is 3 : 4.
Let the number of children be 5 u.
- Number of adults = _____ u
- Number of boys = _____ u
- Number of men = _____ u
- Total number of people = _____ u
Adults |
Children |
3 u |
5 u |
Women |
Men |
Boys |
Girls |
3 |
4 |
1 |
2 |
|
47 x 3 u = 157 u |
13 x 5 u = 123 u |
|
(a)
Change ratio into units.
Boys : Girls : Children
1 : 2 : 1 + 2
1 : 2 : 3
Number of adults = 3 u
(b)
Number of children = 5 u
Fraction of the children that were boys =
13 Number of boys
=
13 x 5 u
= 1
23 u
(c)
Number of adults = 3 u
Fraction of the adults that were men =
47 Number of men
=
47 x 3 u
= 1
57 u
(d)
Total number of people
= 3 u + 5 u
= 8 u
Answer(s): (a) 3; (b) 1
23; (c) 1
57; (d) 8